In 1910, Thomas Andrews brought his wife and young daughter to see the construction of the TITANIC and it's progress when they saw a bright light in the distance flying over the bow. Through reviews of the accounts, historians and scientists concluded that this was Halley's Comet which appears every 76 years and last appeared in 1986. Comets are pieces of rock in gravitational orbit of which gives the tail. The ones viewed by the beings of earth are either in gravitational orbitation of the earth or the sun. The moon however, is too small for the orbit of comets. The comets surrounding the earth eventually too close to the atmosphere and burn up. Those of which ironically orbit the sun, do not come into close enough proximity to burn up. Halley was a revered royal astronomer of which saw the comet, studied records, and predicted that it would appear in 76 years. Sure enough, it was seen 76 years later and 5 years after Halley's death. Thomas Andrews said that the comet was a good omen and some say that but some say today that the one flying over the TITANIC was a bad one. Comets (in general)usually considered good omens are out when something good is happening like when Isaac Newton was born, and probably when Jesus was born (the star for the wise men), when Christopher Columbus was born, and many other happenings. You be the judge on whether Halley's Comet was a good omen or bad.